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Summary
Catriona catachroma and Herviella claror spp. nov. are described from the south-eastern Australian fauna together with a further description of C. viridiana Burn (1962). Catriona, a genus of the family Cuthonidae, comprises two somewhat differing units, here distinguished as Catriona s.s. and Eurycatriona subgen. nov. Marcus (1957, 1958, 1960) has described species of Catriona with characters which would place some in Cuthoninae and others in Tergipedinae as at present defined, thus necessitating revision of the subfamily classification. The absence (Cuthoninae) or presence (Tergipedinae) of a penial stylet offers a convenient system after re-organization of genera. Herviella, a genus of the family Favorinidae, is a new record for the Australian Opisthobranchia.